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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34615b4b482e723e0c5a6da107cf8e9d634e7fe1142a9abdc6340e66cf4978c3' 
  AND token = 'BmqsUb+kqUNT1kda3WEJAgKBtPFMYDNnm1IfGOyylhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}